Ventilator



Dec. 2, 1941. r C DAVlEs 2,265,112

VENTILATOR Original Filed Aug. 1s 1954 INVENTOR CHARLES DA V/ES 'BY N? KATTORNEY Patented Dec. 2, 1941 Y scams. (o1. 230-127-l.Thisiinventionrelates to ventilatorsof thetype intended to providefilteredair to .the'spacento be ventilated.

The primary object of this invention is to provide a ventilatorfurnishing a fully adequate flow of air.

Further important objects of this invention are to provide means tocreate a flow of air which shall be inherently noiseless in itsoperation; which shall deliver air in such manner as to avoid drafts;which shall be simple in structure and efficient in operation.

Other and further objects and advantages of my invention will becomeapparent from the description herein of various preferred embodiments ofmy invention, shown in the drawing in which:

The figure is a vertical cross-sectional view of a ventilator embodyingmy invention in preferred form.

My ventilator comprises a casing I of box-like or similar shape, adaptedto be placed in a window or other opening of the room or other space tobe ventilated and provided with the front and rear walls, 2 and 3respectively. The rear wall 3 is provided with air inlet openings 4protected from the weather by hoods 5, only one of each of the openings4 and hoods 5 being shown. Inside the casing l and adjacent the rearwall 3 an air filter 6 is placed across the flow of air from the inlets4.

The front wall is provided with a circular opening 1. A tube or duct 8of approximately the same diameter as the opening 1 extends backwardlyinto the casing I to a convenient distance. An electric motor 9 ismounted the tube 8 by means of any convenient suspension as shownconventionally at [0.

The motor 9 is provided with a. shaft I l which drives the air impellerl2. The impeller comprises a front plate l3, to the rear of which themotor shaft is attached, a rear ring l4 and peripheral blades l5 heldbetween the front l3 and the rear ring [4. A concave collecting anddeflecting. bowl I6 is attached to the rear ring l4 and extends upwardlyand forwardly over the impeller cage.

A stationary structure co-operating with the rotor structure abovedescribed is mounted at the mouth of the duct 8 by means of the flangell fitting within the tube 8. A skirt l8 depends from the inner edge ofthe flange l1 and is curved forwardly to co-operate with the outersurface of the bowl IE, to provide a Venturi-like annular J6. -i'l1dlllfih9 outer edge of the flange. 1H an outwardly and forwardly flaringguide l9collects,

.-guides and. delivers to =,the roomall the; air. moved by theiimpeller.flat, plate .20,.substantially of the same dimensions as the plate 13,is placed at an appropriate distance in front of the latter; and mayhave its edge curved forwardly as at 2| to provide an annular air exitduct in co-operation with the bell I9. The plate may conveniently bemounted within the bell l9 by means of the spider 22.

In operation, when the impeller is rotated by the motor, air enters theinlets 4, passes through the filter 6 and enters the duct 8. Part oftheair entering the duct passes through the impeller cage, and theremainder is drawn over the outer surface of the bowl IS. The airpassing through the cage is collected by the bowl [6 and directedoutwardly and forwardly. The air drawn over the outside of the bowlpasses through the duct formed by I6 and I8 and joins the air from theimpeller cage. The mingled air is received by the bell I9 and guided anddelivered forwardly into the space to be ventilated in the form of adiverging, annular sheet diflused sufficiently to avoid the creation ofdrafts in spite of the large volume of air moved by the impeller. Thearrows in the figure show the movement of the air through and in thevicinity of my device.

The provision of the plate 20 is a very important feature of myinvention. It prevents the formation of a vacuum by the low pressurearea at the center of the wheel while the edge of the plate co-operatingwith the collector bowl, determines thepressurecharacteristics of thepump. Thus the plate 20 functions, in a manner-comparable to that of thescroll in an ordinary centrifugal blower, to transform or convertvelocity pressure into static pressure; and a good part of theefficiency of my pump arises therefrom.

It is clear that many variations in the application of my invention theventilation of a room may be made without departing from its scope andspirit.

I claim:

1. An air pump comprising a centrifugal impeller wheel, a rotatingcollector and deflector extending over the periphery of the wheel, and

'a stationary plate placed parallel to and in front of the impellerwheel, said plate having its peripheral portion 'extending outwardly andforwardl'y, to block off the space in front of the said wheel.

'2. In apparatus of the class described, an air exit for air drawn overthe exterior of the bowl duct, a centrifugal impeller wheel mounted to3. In apparatus of the class described, an airmounted on and extendingover the periphery of the impeller wheel, a stationarym'ember providedwith a portion extending toward an'd.co" operating with the collector toform' an annular Venturi-like passage for air drawn over the outside ofthe collector, and an outwardly flaring portion adapted to receive anddirect forwardly to rotate in said duct, a collector and deflectormounted on and extending over the periphery of the impeller wheel, astationary member provided with a portion extending toward andco-operating with the collector to form an annular, Venturilike passagefor air drawn over the outside of the collector and an outwardly flaringportion adapted to receive and direct forwardly air from the collectorand from the said annular passage,

and stationary means to block off the space in front of the impellerwheel. duct, a centrifugal impeller wheel mounted to"- rotate in saidduct, a collector and deflector centrifugal impeller mounted to rotate,means mounted on and extending forwardly over ithe 5. In an apparatus ofthe class described, a

periphery of the impeller to collect and dii ect forward air. deliveredby the impeller, stationary peller, said means having portionsco-operating with the collector means aforesaid to convert 1velocitypressure of the air moved by the'impeller -into static pressure.

CHARLES DAVIES. V

